... 3,aluminum gear 4,stainless steel diamond floor grinding machine is not only grinding and polishing concrete, ... for repairing, grinding, polishing, crystallizing millstones.diamond floor grinding machine HWG 70 has the quickest motor speed, from ... is 700 mm, so it is most powerful machine in HONWAY grinding and polishing equipments. It ... grinding and polishing:.... HWG 70 diamond floor grinding machine